Daikin RZQ100B8V3B Service Manual page 141

ESIE05-03
3.3.11 Oil Recovery Operation
Outline When the compressor operates for a certain period of time at low frequency, the oil level in the
compressor may become low due to incomplete oil return.To prevent damage to the compressor and
in worst case avoid compressor lock, an oil recovery operation will be conducted.
Details During the oil recovery operation, the operation frequency of the compressor will be increased for a
time period of 10 minutes.Oil recovery operation is only executed in cooling mode.In heating mode, oil
return to the compressor is guaranteed by the defrost operation.
Example Trigger conditions for 71-class:
When the above conditions are fulfilled, a calculation of the oil discharge amount will be executed
according to the below formula:
When the result of the above calculation is lower than a reference value programmed in the unit's
memory, the oil recovery operation will be started:
Part 2 – Functional Description
Compressor frequency ≤ 63 Hz for 10 minutes continuously.
Oil discharge amount = inverter frequency (Hz) x D x ∆ time
(D = constant value depending on outdoor unit type).
The compressor will operate at a frequency above 63Hz for 10 minutes continuously.
Outdoor Unit Functional Concept
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